Mongol chief Temujin (later to be known as Genghis Khan) falls for Bortai, the daughter of the Tartar leader, and steals her away, precipitating war. Bortai spurns Temujin and is taken back in a raid. Temujin is later captured. Bortai falls in love with him and helps him escape. Temujin suspects he was betrayed by a fellow Mongol and sets out to find the traitor and to overcome the Tartars.